Pipe support vibration isolation is essential in modern building and industrial systems to prevent noise, structural damage, and premature equipment failure.
Two of the most common solutions are rubber hangers and spring hangers.
This article provides a detailed, SEO-optimized comparison to help engineers, facility managers, and specifiers make informed decisions for their projects.
What is Pipe Support Vibration Isolation?
Vibration isolation in pipe supports involves using specialized hangers or mounts to reduce the transmission of vibratory energy from pipes to building structures and sensitive equipment. This is critical for:
Protecting structures and equipment from vibration-induced damage
Reducing noise and improving occupant comfort
Complying with industry standards (e.g., ASHRAE, ASME) for safe and reliable piping systems.
Rubber Hangers: Features, Pros & Cons
Construction & Design
Material: Oil-resistant neoprene or elastomeric rubber, encased in a steel bracket
Design: Loads elastomer in shear for durability; accommodates up to 30° rod misalignment
Deflection: 0.20″–0.57″ (5–15 mm)
Load Capacity: Up to 2,000 lbs (907 kg)
Temperature Range: -20°C to +80°C
Performance
Best for high-frequency vibration and noise isolation (above 10 Hz)
High internal damping for noise reduction
Minimal maintenance; periodic visual inspection recommended
Advantages
Cost-effective for standard applications
Simple, quick installation
Robust, oil-resistant, and long-lasting in moderate environments
Limitations
Less effective for low-frequency vibration (<10 Hz)
Not suitable for very heavy or critical applications
Sensitive to UV, ozone, and extreme temperatures.
Spring Hangers: Features, Pros & Cons
Types & Design
Types: Coil spring, variable spring, and constant support hangers
Material: High-deflection steel springs, often with powder-coated or plated housings
Deflection: 1″–4″ (25–102 mm) or more
Load Capacity: 12–3,850 lbs (5–1,747 kg) and higher for heavy-duty models
Temperature Range: -60°C to 250°C (standard); up to 500°C with special alloys.
Performance
Superior for low-frequency vibration isolation (as low as 3–4 Hz)
Wide load and deflection range for heavy-duty and critical applications
Can be combined with elastomeric elements for broad-spectrum isolation
Advantages
Excellent for heavy loads and large vertical movement (thermal expansion)
High durability and fatigue life
Fail-safe design with high overload capacity
Limitations
Higher initial cost
More complex installation and adjustment
Requires periodic inspection and maintenance.
Rubber vs Spring Hangers: Direct Comparison
Criteria
Rubber Hangers
Spring Hangers
Frequency Range
Best for >10 Hz (high-frequency)
Best for <10 Hz (low-frequency)
Damping
High (good for noise)
Low (combine with elastomer for high-frequency isolation)
Cost
Low to moderate
Moderate to high
Installation
Simple, quick
More complex, requires adjustment
Maintenance
Minimal
Regular inspection/adjustment
Lifespan
Good (moderate conditions)
Excellent (with proper material)
Environmental
Sensitive to UV, ozone, heat, chemicals
Wide temperature range, corrosion-resistant with coatings
Load Capacity
Moderate (up to 2,000 lbs)
High (up to 3,850 lbs or more)
Best For
Light/medium loads, high-frequency noise, cost-sensitive
Heavy loads, low-frequency vibration, critical applications
How to Choose the Right Vibration Isolator
Selection Guidelines
Use rubber hangers
High-frequency vibration/noise
Light to medium loads
Cost-sensitive or space-constrained projects
Residential, light commercial, or fire protection systems
Use spring hangers
Low-frequency vibration (e.g., near pumps, compressors)
Heavy loads or large vertical movement (thermal expansion)
Industrial, power plant, or critical HVAC applications
Use combination (spring + rubber) hangers
Broad-spectrum vibration isolation (both low and high frequencies)
Environments with both heavy equipment and noise-sensitive areas (e.g., studios, hospitals).
Industry Applications & Case Studies
Industry/Application
Preferred Hanger Type
Example/Reason
Power Plants
Spring Hanger
Accommodates large thermal movement in steam lines
Chemical Processing
Spring Hanger
Required for lines with significant expansion/contraction
HVAC (Commercial/Industrial)
Spring Hanger
Superior low-frequency isolation for large equipment and ductwork
HVAC (Residential/Light)
Rubber Hanger
Cost-effective, easy to install, sufficient for moderate vibration
Fire Sprinkler Systems
Rubber Hanger
Lightweight, economical, meets code for non-critical vibration isolation
Recording Studios/Theaters
Spring + Rubber
Dual-stage isolation for maximum sound and vibration attenuation
Conclusion
Selecting the right vibration isolation hanger is essential for the safety, comfort, and longevity of your piping system.
Rubber hangers offer a cost-effective solution for high-frequency noise and light-to-medium loads, while spring hangers provide superior low-frequency isolation and support for heavy-duty applications.
For the most demanding environments, combination hangers deliver the best of both worlds.
Frequently Asked Questions (FAQs)
What is the main difference between rubber and spring hangers?
Rubber hangers are best for high-frequency vibration and noise, while spring hangers excel at isolating low-frequency vibration and supporting heavy loads.
Can I use rubber hangers for heavy industrial piping?
Rubber hangers are generally not recommended for very heavy or critical applications; spring hangers or combination types are preferred.
How often do I need to maintain these hangers?
Rubber hangers require minimal maintenance (periodic inspection). Spring hangers need regular inspection and occasional adjustment.
Are combination hangers worth the extra cost?
For environments with both low and high-frequency vibration, combination hangers provide superior performance and are often worth the investment.